Adjustable gauge



Das., 25 11923.,

J. BATH ADJUSTABLE GAUGE Filed mi. L@

Patented Dec. 25, 1923.

nia sus than and eric.

JOHN BATH, F WORCESTER, MASSACHUSETTS, SSIGNOR TO JOHN BATH & CO., INC., OF WORCESTER, MASSACHUSETTS, CORPORATION OF MASSACHUSETTS.

ADJUSTABLE GAUGE.

Application filed August 20, 1920. Serial No. 404,720.

To all who/m, it may concern.'

. Be it known that I, JOHN BATH, a citizen of the United States, resi-ding at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Adjustable Gauge, of which the following is a specification.

This invention relates to an adjustable gauge for accurate measurements of internal diameters. 1t is the general object of my invention to provide a construction in which no other part of the gauge extends beyond the ends of the gauge bars, so that measurements may be accurately made to the extreme inner end of a hole, or against an internal flange or shoulder.

An important feature of my invention relates to the provision of novel adjustingdevices for preventing end play of the actuating member in the gauge, the adjustment being made through a recess in the side of the body or handle instead of at the end of the gauge, as in certain gauges heretofore designed by me.

Another feature relates to the provision,

of gauge bars havingthreade-d outer surfaces, thus affording an adjustable internal thread gauge. l have also provided a novel yielding feed device by which uniform tension may be secured on repeated measurements.

My invention further relatesto arrangements and combinations of parts which will be hereinafter dest ibed and more particularly pointed out in the appended claims.

A preferred form of my invention is shown infthe drawings in which y Fig. 1 is a side elevation of my improved gauge; i

Fig. 2 is a horizontal sectional view thereof;

Fig. 3 is an end elevation Yof the gauge shown in Fig. 1, but showing a different type of gauge bar;

Fig. 4 is a transverse sectional view taken on the line 4-4 in Fig. 2, and

Fig. 5 is a detail view of a part to, be de scribed.

10 and having its outer end threaded to re- Y oeive a lmember 12 which is provided with a-,plurality of dove-tailed inclined grooves 'to take up wear or lost threaded portion 29 on which collars 13 (Fig. 3) in which gauge bars 14 of simi-I lar cross section are mounted for. relative sliding movement.

rlhe body 1() has a flange 15 at the end adjacent the bars 14, said flange being provided with radial slots 16 through which studs 17 extend into the adjacent ends of the gauge bars 14. The bars *14 are thus held from longitudinal movement relative to the flange 15 and body 10 while the slots l.16 permit the bars to be moved radially inward or outward as the member 12 is moved axially by turning the shaft 11.` The member 12 has a cylindrical extension 18 which protects the thread of the shaft 11 as the member12 is moved outward.

A nut 19 is threaded into the outer end of the member 12 and is also threaded to fit the end of the shaft 11. The nut 19 may be adjusted angularly by removing a cap 2() which covers a recess in the end of the member 12. r"When the nut 19 is thus adjusted motion betweenthe member 12 and the threaded shaft, a binding screw 21 may be tightened to hold the nut in adjusted position.

The body 10 is provided with an internal annular flange or shoulder 22 against the opposite faces of which hardened steel discs 23 and 24 are firmly seated. A collar 25 is secured to the shaft 11 by a taper pin 26 and a hardened steel washer 27 is positioned between the collar, 25 and the disc 23. The pin 26 may ing in the body 10, normally closed by a threaded plug 10a. A pin 28 may be inserted between the collar 25 an-d the washer 27 to insure rotation of the washer with the collar so that all wear and friction will be limited to the hardened surfaces' of the disc 23 and washer 27.

The shaft 11 is provided with a second 30 and 31 are mounted, the collars preferably being separated by a washer 32 (Fig. 5) having a lug 33 adapted to project into a keyway in the threaded. portion 29 of the shaft 1l and thus prevent' relative rotation of the washer 32. The collars 30 and 31 are preferably provided with a number of radial holes 34, andthe body 10 has a recess 35 in -one side through which a suitable tool may be inserted in holes34 to turn the' collars and thus take up end play of the shaft 1 1. The collar 30 isthe adjustmg collar and is preferably of hardened steel while the collar 31 acts as a lock nut, its action being rendered more certain by the use of the nonrotatable washer A plate 36 may be provided to cover the recess 35 and exclude dirt therefrom.

Suitable devices are provided for indicating the exact size to which the gauge is set. For this purpose, a rod 37 is adjustably selJ cured in the member 12 by a binding screw 38. The rod 37 is slid'able in a recess 39 in the body 10. A portion of one side of the recess is cut away as shown at 40 in Fig. l,

so that an index mark on the rod 37 may be l5 read in connection with a scale adjacent the opening 40.

A second index mark at the handle end of the body co-operates with graduations ona ring 41 adjustably mounted to rotate 2U with-the shaft 11. The ring 41 is connected with the shaft 11 by means of a collar 42 held in fixed position on the shaft by a stud or screw 43. The ring 41 and collar 42 are provided with teethl at their adjacent edges f5 which prevent relative angular movement Aof the parts when the collar 42 is fixed to the shaft 11. No claim is made to the indicating devices in this application as these devices form part of the subject matv ter of prior applications numbered 351,686

and 402,608.

-For the efficient lubrication .of all parts ofthe gauge, I have provided a recess or chamber 44 in the shaft 11 connected by suitable cross passages to all of the wear ing surfaces. This chamber 44 may be filled with a suitable lubricant, retained therein by a plug 45 closing the outer'end of the chamber and held in position by aibinding screw 46.

It is desirable that successive readings may be taken with the gauge under the same angular tension on the shaft 11 and forthis purpose I provide a disc 47 loosely mounted on the outer end of the plug 45 and having teeth or Iserrations on one face c'o-operatin with similar teeth on the collar 42. The disc 47 is also provided with openings 48 to receive spring pressed plungers49- 50 which frictionally engage a second disc 50 fixed t o the end of the plug 45. When the gauge is to be adjusted, the disc 47 is turned until a certain'pressure is placed on the gauge bars. Further tension applied to the `v disc 47 merely causes the teeth. of the disc to slip lpast .the corresponding teeth of the collar 42, overcoming the pressure'of the plungers 49.

rIhe gauging surfaces of the bars `114 will be 'adapted to the purposes for which the gauge is to be'used and are shown herein as threaded for use as.; an internal thread gauge. Having thus described-the construction of my improved'gauge,'5the use and operation thereof will be rea`dily apparent. As the Lemmi shaft .11 is turned in the body 10, the mem' ber 12 is moved axially and the gauge bars 14 are moved radially inward or outward in accordance with the direction of rotation of the shaft 11. The gauge may beV adjusted at a uniform tension by turning the shaft by means of the disc 47. The exact gauge reading will be indicated by the rod 37 and the graduated ring 41.

Having thus described my invention it will be evident that changes and modifications can be made therein by those skilled in the art within the spirit and scope of my invention as set forth in the claims, and I do not wish to be otherwise limited to the details herein disclosed, but what I claim is. j

1. An adjustable gauge comprising a body, a threaded shaft mounted for rotation only in said body, a member threaded thereon and provided with surfaces inclined toy the axis of said shaft, a plurality of gauge i bars having portions contacting with said inclined surfaces slidably mounted in said member and movable simultaneously radial-- ly thereby, and means to hold said bars in fixed longitudinal relation to said body, the gauging surfaces of said bars being formed as sections of a threaded cylinder. j

2. An adjustable gauge comprising a body, a threaded shaft mounted for rotation only in said body, a member threaded thereon and provided with surfaces inclined to the axis of said shaft, a plurality of gauge bars having portions `contacting with said inclined surfaces slidably mounted in said member and movable simultaneousl radi- 'ally thereby, and means to hold said bars in 'fixed longitudinal relation to said body,` i'

said body having an annular, inwardly projecting portion, and said shaft having a thrust collar fixed thereon and engaging one side of said annular portion and having a second collar longitudinally adjustable thereon and engaging the opposite side of said annular portion, whereby relative longi-v 'tudinal movement of said shaft and body in either direction is prevented.

3. -An adjustable gauge comprising a body, a threaded shaft mounted for vrotation ,only in said body, a member threaded thereon and -provided with surfaces inclined to the axis of said shaft, a plurality of gauge bars having portions contacting withsaid inclined surfaces slidably mounted in said member andmovable simultaneously radially thereby, means to hold said bars in fixed longitudlnal relation to said body, and an adjustable locking collar threaded 'on said shaft to prevent relative llongitudinal movement thereof, said body` being recessed at one side to give access to said collar for adjustment thereof.

4. An' adjustable gaugecomprisingl a tation only in said body, a member threaded thereon and provided With surfaces inclined to the axis of said shaft, a plurality of gauge bars having portions contacting with said inclined surfaces slidably mounted in said member and movable simultaneously radiall thereb means to hold said bars in fixed ongitudinal relation to said body, and adjusting and locking collars threaded on said shaft to prevent relative longitudinal movement thereof, said collars each having a lurality of radial holes therein and said bo y having an opening at one side through which a tool may be inserted in said holes to turn said collars.

5. An adjustable gauge having in combination a body, a threaded shaft mounted for y rotation only in said body, a member threaded thereon and provided with surfaces inclined to the axis of said shaft, a plurality of gauge bars having portions 'contacting with said inclined surfaces slidably mounted in said member and held in xed longitudinal `relation to said body and movable simultaneously radially thereby, and means to turn said shaft with a predetermined tension, said means including a serrated collar fixed to said shaft, a serrated disc rotatable relative to said shaft, a disc fixed relative to said shaft, and spring plungers mounted in one of said discs and movable longitudinally toyieldingly engage the other disc.

6. An adjustable gauge having, in combination, a body, a threaded shaft mounted for rotation only in said body, a member threaded thereon and provided with surfaces inclined to the axis of said shaft, a

plurality of gauge bars having portions contacting with said inclined surfaces slidably mounted in said body and movable simultaneousl radially thereby, and means to turn said s aft With a predetermined tension, said means including a serrated collar slidable and rotatable on said shaft, a serrated `element fixed on said shaft, and means to press the two serratedy parts yieldingly together.

ln testimony whereof I have hereunto aixed my signature.

JHN BATH. 

